If you're adding on to the house, can you have the roofers install a solar tube light? We have three and couldn't believe what a difference they made. My interior bathroom is now full of natural light during the day, and moonlight at night... so much so that we have to close the bathroom door around the full moon or we can't sleep! They are very affordable.
Here's a link to give you an idea:
http://www.marylandroofers.com/sun-tunnels-skylight.php